Imse Vimse are nice thick liners that can be washed 3 times if not soiled before tossing. Bububibi has some nice liners as well although they are more narrow and can really only be washed once (if not soiled) before tossing.

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Liners to keep the wetness away??? I just use fleece I cut up into pieces

Liners for poop? I LOVE my Imse Vimse liners. I line every single diaper with one and if there is no poop I just throw the whole thing in the pail and it gets washed. Then I air dry the liners (although I accidentally dried a few in the dryer and they came out ok). I've gotten as many as 4 uses out of them that I was able to track so far.. possibly more. I just toss them when they come out torn from the washer but it's not like they disintegrate in there or anything
If there is poop, I use flushable wipes and those plus the liners get flushed. They work super well... I just had an incredibly messy and horrible blueberry poop diaper the other day and the liner worked like a charm.